This material is often used to create shiny or metallic surfaces.
Most attributes of metal can be created using this material alone or it can be used with other coatings to create materials like metallic car paint and similar layered surfaces when combined with a Lama layering utility node.
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Conductor Properties
Conductor Tint
The correct way to color the material physically is by using the controls under the Fresnel Mode selection.
True metallic materials would retain the white color. Make subtle changes here to avoid losing all physicality as this control result is multiplied against reflected ways.
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Microfacets or tiny bits of roughness can scatter light in a way that has a blurry result. The less rough, the mirror-like and smooth/slick the material may look. High values will simply look diffuse.
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Roughness examples : 0.0 / 0.2 / 0.4 / 0.6 / 0.8 / 1.0
Normal/Bump
Here is where you supply a signal, either a texture or procedural pattern, to create a bump to the surface to "fake" surface details like small bumps or scratches. This means an artist doesn't have to model these tedious and often repetitious parts of a model.
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Tail Parameters
Mix
How strong the reflection tail effect is as a linear measurement 0 to 1, or maximum strength
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Mix Examples : 0.0 / 0.2 / 0.4 / 0.6 / 0.8 / 1.0
Length 0.5
Length
How rough/wide the effect is from none at all to 1 or to none with a negative value.
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Anisotropy Parameters
Anisotropy
Defines the strength of the anisotropy that may appear as a stretching effect, negative values are also accepted.
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Anisotropy Examples : 0.0 / 0.2 / 0.4 / 0.6 / 0.8 / 1.0
Rotation : 0
Direction
Overrides the built-in surface direction using a signal from a pattern, which may be referred to as "brushing direction" for brushed or textured metals.
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Rotates the direction (possibly defined above) 0 to 360 degrees around the surface normal.
Iridescence Parameters
Thickness
Adding material thickness (in nanometers) may cause iridescence to be visible, like a diffraction or "rainbow" effect.
IOR
The thin film effect defined above may have a measured Index Of Refraction that can be defined here.
Rotation Example : 0 - 1
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Advanced Parameters
Exterior IOR
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This defines the name of the lobe output of the final lobe weight to an Arbitrary Output Variable (AOV)
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RenderMan Fundamentals
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